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China has stepped up its war of words with India over a tense border dispute, saying it will defend its territory “at all costs”, after a video emerged of soldiers from the two sides pushing and shoving each other.

"It is easier to shake the mountains than to shake the PLA,” Defence Ministry spokesman Wu Qian said as he reiterated the “determination” of China’s People’s Liberation Army.

Both sides have been facing off on a thin strip of land in the Himalayas bordering both countries and Bhutan.

China is constructing a road in the region which India sees a strategic threat to a narrow part of territory leading to its north eastern states which is known as the ‘chicken’s neck’.

Mr Wu also said China would conduct “targeted deployment and exercises” along the disputed border area, raising the spectre of increased military movements in the tense region.

Indian Prime Minister Narendra Modi, left, and Chinese President Xi Jinping listen to a speech during the BRICS Leaders Meeting with the BRICS Business Council in Goa, India, last OctoberCredit:
AP

Last week China conducted live-fire drills on the Qinghai-Tibet Plateau, and such exercises will continue if Indian troops are not withdrawn from the stand-off, Mr Wu said.

"We will preserve our sovereign territory and security interests at all costs," he said, in what is being seen as China’s strongest warning yet to New Delhi since the dispute began a month ago.

"The 90-year history of the People's Liberation Army has proven that, when it comes to safeguarding our sovereignty and territorial integrity, our capabilities keep strengthening while our determination remains firm.”

Meanwhile, a video has emerged which shows soldiers from India and China pushing each other on a grassy flatland.

The leaked clip of around 20 apparently unarmed troops was originally circulated by Indian news outlets before being picked up by Chinese media.